php - Upload png image black background -

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when upload png image php, background color of image setted black.
tried set transparent background doesn't work.
code :

if( $image_type == imagetype_png ) {     $dst_r = imagecreatetruecolor($targ_w, $targ_h);     imagealphablending($dst_r, false);     imagesavealpha($dst_r, true);     imagefill($dst_r,0,0,imagecolorallocatealpha($dst_r, 0,0,0,127));     imagecopyresampled($dst_r, $this->image, 0, 0, $targ_x, $targ_y, $targ_w, $targ_h, $targ_w, $targ_h);     imagepng($dst_r,$filename, 9); }

edited:

i tought i'v finished problem wrong:

$targ_w_thumb = $targ_h_thumb = 220; if($image_type == imagetype_png) {     $dst_r = imagecreatetruecolor($targ_w_thumb, $targ_h_thumb);     imagealphablending($dst_r, false);     imagesavealpha($dst_r, true);     imagefill($dst_r,0,0,imagecolorallocatealpha($dst_r, 0,0,0,127));     imagecopyresampled($dst_r, $this->image, 0, 0, $targ_x, $targ_y, $targ_w_thumb, $targ_h_thumb, $targ_w, $targ_h);     imagepng($dst_r,$filename, 9); }

imagecreatetruecolor() creates image filled opaque black. unless fill new image transparency first, black show through later.

all need imagefill() transparent colour - namely black, this:

imagefill($dst_r,0,0,imagecolorallocatealpha($dst_r, 0,0,0,127));  // transparency values range 0 127

applied code, should work:

if( $image_type == imagetype_png ) {     $dst_r = imagecreatetruecolor($targ_w, $targ_h);     imagealphablending($dst_r, false);     imagesavealpha($dst_r, true);      // paint watermark image transparent color remove default opaque black.     // if don't black shows through later colours.     imagefill($dst_r,0,0,imagecolorallocatealpha($dst_r, 0,0,0,127));      imagecopyresampled($dst_r, $this->image, 0, 0, $targ_x, $targ_y, $targ_w, $targ_h, $targ_w, $targ_h);     imagepng($dst_r,$filename, 9); }

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